This study investigated the effects of eight weeks of high velocity isokinetic and isometric ballistic strength training on velocity-specific adaptations. Males (N = 20) were divided into two groups; isokinetic contractions at 300 deg/sec (N = 9) and isometric ballistic at 60 degrees knee angle (N = 11). Ss were tested for peak torque and power at 60, 120, 180, 240, and 300 deg/sec and for maximum isometric peak torque.

There were no changes in most aspects of muscle fiber type in either group. MHC type I and IIa percentage changed from 32.8% to 41.9% and from 52.4% to 42.5% in the isometric ballistic group. Maximum isometric peak torque and rate of force development improved in both groups. Isokinetic function improved only in the isokinetic group.